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为提高上海地区10 kV电网的供电可靠性,需要潮流控制能力强的柔性交流输电(flexible AC transmissionsystems,FACTS)装置来实现10 kV电网的合环运行,而统一潮流控制器(unified power flow controller,UPFC)就是一种很好的选择。文章对基于H桥级联技术的UPFC拓扑结构进行了研究,通过仿真实验对级联型UPFC的动态性能进行分析和验证。仿真实验结果表明,省略掉串联变压器的H桥级联型,UPFC能够有效控制线路潮流并维持直流电压恒定,采用脉宽调制技术有效消除了中低次谐波。
In order to improve the power supply reliability of the 10 kV power grid in Shanghai, flexible AC transmissions (FACTS) devices with high power flow control are needed to realize the coordinated operation of 10 kV power grids. The unified power flow controller UPFC) is a good choice. In this paper, the topology of UPFC based on H-bridge cascade technology is studied. The dynamic performance of cascaded UPFC is analyzed and verified through simulation experiments. Simulation results show that omitting the H-bridge cascade connection of series transformer, UPFC can effectively control the line current and maintain the constant DC voltage, and the pulse width modulation technique can effectively eliminate the low-order harmonics.